Airtel is the best network than others. I uses airtel last 4-5 years and no complain till now. everywhere when I go I found full network in my smartphone this is the best part of airtel that when in emergency its can call or message fastly than other services.
and customer rating is high bcoz when I need to talk with customer care its get connected fastly than others not to listen many advertisement like others operators.
and its giving best offers than other operator. I used 349 pack of it and unlimited local std call and free internet 2 GB /day. so that is the best part of comminication.